Playfair cipher
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The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution cipher. The scheme was invented in 1854 by
Lord Playfair, who heavily promoted its use.
The Playfair system was invented by Charles Wheatstone, who first described it in 1854.
Charles Wheatstone
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Sir Charles Wheatstone was an English physicist and inventor best known for his contributions to the development of the Wheatstone bridge, originally invented by Samuel Hunter Christie, which is used
Playfair cipher
…Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution cipher. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair for promoting its use. The technique encrypts pairs of letters (bigrams or digrams), instead of single letters as…
Sketch of Wheatstone by Samuel Laurence, 1868
Plaque marking a childhood house in Gloucester
Wheatstone English concertina
Wheatstone in later years